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Category:   Application (Generic)  >   rxvt-unicode Vendors:   rxvt-unicode
(Gentoo Issues Fix) rxvt-unicode Long Escape Sequence Buffer Overflow May Allow Code Execution
SecurityTracker Alert ID:  1013491
SecurityTracker URL:  http://securitytracker.com/id/1013491
CVE Reference:   CVE-2005-0764   (Links to External Site)
Date:  Mar 21 2005
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 5.3
Description:   A vulnerability was reported in rxvt-unicode. A user may be able to execute arbitrary code on the target system.

A user can supply a long escape sequence to trigger a buffer overflow and potentially execute arbitrary code.

The buffer overflow resides in 'command.C'.

Impact:   A user may be able to execute arbitrary code.

[Editor's note: It is not yet clear if this is a remote or local vulnerability.]

Solution:   Gentoo has issued a fix and indicates that all rxvt-unicode users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-terms/rxvt-unicode-5.3"

Vendor URL:  dist.schmorp.de/rxvt-unicode/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Mar 14 2005 rxvt-unicode Long Escape Sequence Buffer Overflow May Allow Code Execution



 Source Message Contents

Subject:  [Full-disclosure] [ GLSA 200503-23 ] rxvt-unicode: Buffer overflow


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Gentoo Linux Security Advisory                           GLSA 200503-23
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: rxvt-unicode: Buffer overflow
      Date: March 20, 2005
      Bugs: #84680
        ID: 200503-23

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Synopsis
========

rxvt-unicode is vulnerable to a buffer overflow that could lead to the
execution of arbitrary code.

Background
==========

rxvt-unicode is a clone of the well known terminal emulator rxvt.

Affected packages
=================

    -------------------------------------------------------------------
     Package                 /  Vulnerable  /               Unaffected
    -------------------------------------------------------------------
  1  x11-terms/rxvt-unicode        < 5.3                        >= 5.3
                                                                 < 4.8

Description
===========

Rob Holland of the Gentoo Linux Security Audit Team discovered that
rxvt-unicode fails to properly check input length.

Impact
======

Successful exploitation would allow an attacker to execute arbitrary
code with the permissions of the user running rxvt-unicode.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All rxvt-unicode users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-terms/rxvt-unicode-5.3"

References
==========

  [ 1 ] CAN-2005-0764
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0764

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200503-23.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.0

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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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